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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - intel-virtual-output: one remote head fails to update"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76271#c19">Comment # 19</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - intel-virtual-output: one remote head fails to update"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76271">bug 76271</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=76271#c18">comment #18</a>)
<span class="quote">> top looks perfectly normal, Gnome Shell is at about 8%, below are the first
> few lines of perf top:
>
> 25.91% nvidia_drv.so [.] 0x00000000000935a0
> 5.51% [drm] [k] drm_clflush_page
> 3.29% [vdso] [.] 0x0000000000000422
> 2.74% intel_drv.so [.] 0x00000000000513c0
> 1.92% libv8.so [.] 0x0000000000242052
> 1.53% libglib-2.0.so.0.3800.1 [.] 0x000000000008986e
>
> (Note: I'm running a low-latency kernel. No idea if it matters.)</span >
Eek, nvidia how could you. Just as disturbing is the drm_clflush_page, but that
is likely to be due to DRI.
<span class="quote">> The lag persists after turning on FORCE_16BIT_XFER.
>
> Where do I set Option "AllowSHMPixmaps" "true" ?</span >
There should be a bumblebee config file for setting what options to pass to the
nvidia server, I think it is /etc/bumblebee/xorg.conf.nvidia. Add the Option to
Section "Device"
<span class="quote">> Compilation with DBG=1 gives me plenty of errors in 3310ee89c1f1a.</span >
Fixed.</pre>
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